AWS CLI - Check the cheaper spot on an given Region and Instance Type and return the AZ name

aws-cli-spot-get-cheaper-by-region

#!/bin/bash

# Return cheapper AZ for an given instance type and region
# Eg: $0 us-east-1 r3.8xlarge [all]

# AWS Region [Eg. us-east-1 ]
R=$1

# AWS Instance Type [Eg. r3.8xlarge ]
I=$2

FILTER=|jq '.|=sort_by(.price)'[0].az

test -z $R && ( echo "Region not found."; exit 1)
test -z $I && ( echo "Instance type not found."; exit 1)

RES=$(aws --region=$R \
  ec2 describe-spot-price-history --instance-types $I \
  --start-time=$(date +%s) \
  --product-descriptions="Linux/UNIX" \
  --query 'SpotPriceHistory[*].{az:AvailabilityZone, price:SpotPrice}')

if [[ "$3" == 'all' ]]; then
    echo $RES |jq '.|=sort_by(.az)'
    exit 0
fi

echo $RES |jq '.|=sort_by(.price)'[0].az

exit 0